- Inline single-call-site functions
- Pull out pre-check from AllocateVariablesRecursively

Change-Id: Ieceaf2d5b3ef6902b293d09e6fa63e58e60f3607
Reviewed-on: https://chromium-review.googlesource.com/c/1426696Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59025}